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Why Injections Outperform the Supplements on Your Shelf That bottle of B12 pills sitting in your medicine cabinet might not be doing much for you
All controlled studies referenced below were conducted in cell culture (3T3-L1 adipocytes, primary muscle stem cells) or rodent models (diet-induced obese mice, aged C57BL/6J mice)
Mental clarity Because B12 supports nerve signaling, injections may help improve focus, concentration, and the foggy feeling associated with low B12 levels
The large intestine: Its role in mammalian nutrition and homeostasis: Wiley New York
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